Automatic pressure safety control



arch 25 1924.

J. ELLMAUER AUTOMATIC PRESSURE SAFETY CONTROL Original Filed May 5Patented Mar. 25 19241.

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JOSEF ELLMAUER, F MILWAUKEE, WISC-DNESIN, ASSIGNOR TO BEFRIGO CORPORA-TION, 0F MILWAUKEE, WISCONSIN, A CORPORATION OF WISCONSIN.

AUTOMATIC rnnssunn sernrrr CONTROL.

Application filed May 1921, Serial 'No. 467,064. Renewed February 11,1924.

To all whom it may concern: 7

Be it known that I, Josnr ELLMAUER, a citizen of the United States ofAmerica, residing at Milwaukee. in the county of Mil- 5 waukee and Stateof Wisconsin, have in 'vented certain new and useful Improvements inAutomatic Pressure Safety Controls, of which the following is aspecification.

The arimary object of the invention is the automatic control of thefluid pressure systern of refrigerating apparatus and more especiallyrelates to a fluid pressure dia phragm for actuating the electricalswitch controlling motor of the compressor for the system.

A. further object of the invention is the provision of a diaphragmactuated switch with automatic means for cutting off the supply of fluidin the event of accidental breaking of the diaphragm.

A still further object of the invention is the provision of a diaphragmactuated controllin switch for a fluid pressure plant, and having aquickly operating or snap-movement whereby the opening and closing ofthe electrical circuit takes place quickly, preventing arcing of thecurrent.

With these general objects in View, the in vention consists of the novelcombination 30 and arrangement of parts hereinafter more fully describedin connection'with the accompanying drawing and in which like referencecharacters designate corresponding parts throughout the several views.

In the drawing,

Figure 1 is an end elevation of the device installed for operation,

Figure 2 is a vertical longitudinal sectional view of the device withthe electric switch mechanism shown in side elevation, and

Figure 3 is a detail elevational view of the valve seat within thediaphragm casing.

Referring more in detail to the drawing it will be first understood thatit is desirable to maintain the fluid pressure in the piping or systemof a refrigerating apparatus substantially constant which can beeffected by the starting and stopping of the electric motor furnishingpower for the compressor acting upon the refrigerating fluid of thesystem. The pipe herein illustrated communicates with the piping systemso as to receive the fluid under pressure and conduct the same into thecentral chamber 11 of a diaphragm casing formedin two sections 12 and 13secured together by bolts 1 1. A diaphragm 15 of suitable flexibility issecured between the sections 12 and 13 dividing the chamber 11 intosubstantially two equal parts, a gasket 16 of lead or similar metalbeing secured between the marginal portion of the section 12. V The pipe10 being tapped centrally through the casing section 12 into what isherein termed the forward portion of the chamber 11 has a lead gasket 17overlying its inner end and spun over into an annular groove 18 formedby a central boss 19 upon the inner face of the section 12 and acting asa valve seat around said fluid pressure pipe 10. A valve 20 within theouter portion of the chamber 11 has a rounded face normally engaging theadjacent side of the diaphragm 15 with a stem 21 slidably positionedthrough a central perforation 22 in the casing sect-ion 13.

Adjustable actuating means for the Valve 20 consists of inner and outerheads 22 and 23 respectively herein illustrated in the form of circulardisks rigidly connected together by bolts 24; sliding thr'ough openingsand 26in the casing-sections 12 and 13 with said heads positioned uponopposite sides of the casing. The outer end of the valve stem 21 ismaintained in constant engagement with the center of the outer head 23by means diaphragm 15 and the casing v of springs 27 surrounding thebolts 2 1 and tensioned between the head 22 and the casing section 12,it being noted that the head 22 is freely mounted upon the pipe 10 bymeans of a central opening 28 in the head 22 through which the pipe 10extends, acting as a guide. Variations in pressure of the fluid withinthe pipe 10 control the flexing of the diaphragm 15 while the action ofthe springs 27 regulate the pressure of the valve 20 upon the diaphragm15 consequently rendering the device adjustable whereby the valve 20will be shifted rearwardly when the fluid pressure reaches or exceeds apredetermined degree. The tension of the springs 17 is regulated forthis purpose by means of locking nuts 29 threaded upon the rods 24: atopposite sides of the head 23. It will be noted that should thediaphragm 15 become disrupted the springs 27 surrounding the rods 24will exert a suflicient pressure between the sliding head 22 and thediaphragm casing so as to cause the lllal s2,

valve 20 to seat upon the gasket 17 of the inlet pipe 10 to consequentlycut oil the flow of fluid into the chamber 11.

The compressor not shown for the fluid within the pipe 10 is operated bya motor having circuit wires 30 and 81 electrically connected to astationary terminal 32 and a pivot switch point 33 respectively. Theswitch point 33 is normally maintained in contact with the terminal 32and the circuit for the electric motor closed by any suitable means suchas the leaf spring 34:.

A plunger 35 is longitudinally slidable in spaced supports 36 and 37with an insulated tip 38 upon one end adapted for engaging the point 33and opening the switch at one extremity of the longitudinal movement ofthe plunger A lever 39 is pivoted upon an arm 440 carried by the casingsection 13 with a head ii at one end ii'reely positioned in a transverseslot 4-2 of the valve stem 21. A head 43 upon the opposite end of therod 39 is freely positioned within a yoke 4 d carriedby the plunger 35between the supports 36, and 37, it being evident that a movement of thevalve stem 21 in either direction imparts longitudinal movement of theplunger by means oi the lever 39. V

The gabled or ll-shaped upper surface of the yoke a l is constantlyengaged by the rounded end 46 of a leaf spring l7 and whereby the yokedi is snapped quickly in' either opposite direction upon being shifted bythe lever 39 until the spring end l6 passes slightly beyond the apex Orridge of the yoke 44.

The complete operation of the invention will be fully understood fromthis detail description thereof, the mechanism being with a diaphragmunflexed when the fluid pressure in the pipe 10 is normal. An increasein the fluid pressure liexcs the diaphragm 1 3, rearwardly shifting thevalve 20 and causing its stein 2i to rearwardly move the lower end ofthe lever 39'causing the upper end as therooi to force the yoke 4d andplunger toward the switch point t3. illustrated in Fig. 2 of thedrawing, the round end d6 will ride down the rearward side of thesurface il causing the plunger to move quickly forward engaging theinsulated tip against the switch point 323 and swinging said point tothis circuit opening position out of contact with the termi- The head isthereby brought in contact with the rear end oi the head re ceivingsocket d8 oi the yoke l i whereby a hen the oke l4: aasses tneJointdecrease in the fluid pressure caused by stopping the electricallyoperated compressor permits the springs 27 to return the valve 20 to itsnormal position shiitingthe plunger 35 rearwardiy and releasing theswitch point 33' for automatic contact with the terminal 32. The fluidpressure in the pipelO is thereby automatically maintained substantiallyconstant through the control of the electric switch 3233 by theactuation of the diaphragm i5.

lVhile the form of the invention herein set forth is believedpreferable, it will nevertheless be understood that minor changes may bemade without departing from the spirit and scope oi theinvention.

What is claimed as new is 1. Bin automatic controlling device for fluidpressure piping comp ising a casing having a chamber to which the end oithe piping communicates. a metallic gasket formed within the chamberadjacent the outlet end of said pipe, said gasket eil'ecting a valveseat for the end of the piping within said chamber, a flexible diaphragmtransversely of the chamber, and a controlling valve resilientlymaintained against the. opposite side of the diaphragm from said seatadapted for automatically closing upon the seat upon the accidentalbreaking of the diaphragm.

2. An automatic controlling device for fluid pressure piping comprisinga casing having a chamber to which the end of the piping communicates,the said casing having an annular groove within the chamber formed by acentral boss, a metallic gasket having its outer edge spun over into theannular groove, said gasket effecting a valve seat around the end ofsaid pipe, at flexible diaphragm transversely of the chamber, and acontrolling valve resiliently maintainer against the opposite side ofthe diaphragm from said seat adapted for automatically closingupon theseat upon the accidental breaking of the diaphragm. I

3. An automatic controlling d vice for fluid pressure piping, comprisinga casing having chamber to which the end oi the 1 piping communicates, ametallic gasket formed within the chamber adjacent the outlet end ofsaid pipe eiiecting a valve seat r the end oi the piping within saidchamher, a flexible diaphragm transversely of the chamber, and n'ic'ansadapted for automatically closing upon the seat upon the accidentalbreaking of the diaphragm.

in testimony whereof I aifix my signature.

JOSEF ELLMAUER.

